Abstract

RAGA, A. C.; CANTO, J.  and  NORIEGA-CRESPO, A.. The HII Regions and Bow Shocks Around Runaway o Stars. Rev. mex. astron. astrofis [online]. 2022, vol.58, n.2, pp.395-402.  Epub Mar 20, 2023. ISSN 0185-1101.  https://doi.org/10.222a01/ia.01851101p.2022.58.02.18.

We present a model for the HII region and stellar wind bow shock formed by runaway O stars passing through the Galactic disk. We develop a quasi-analytic approach in which the absorption of stellar ionizing photons by the bow shock is considered. With these models we study the transition between a detached ionization front (leading the bow shock) and an ionization front trapped by the stellar wind bow shock. We find that for an O7 star one needs to have a stellar velocity of only a few km/s and an environmental density > 105 cm−3.

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